火焰原子吸收光谱法测定金精矿中铅的测量不确定度评定

Uncertainty evaluation on measurement results for the determination of lead in gold concentrates by flame atomic absorption spectrometry

根据《测量不确定度评定与表示》(指南),以火焰原子吸收光谱法测定金精矿中的铅含量为例,对测量结果进行了不确定度评定。在分析了不确定度的重要来源(包括称样质量、工作曲线拟合、标准工作溶液及试液定容体积等引入的不确定度分量组成)基础上,对各不确定度分量进行了分析计算,求得合成标准不确定度为0.068%,扩展不确定度为0.14%。

Based on 〈 The Guidebook of Uncertainty Evaluation and Denotation of the Measurement Results 〉 , the measurement data of lead in gold concentrates by flame atomic absorption spectrometry were collected and the measurement uncertainty was evaluated. The results show that the main sources of the total uncertainty consist of partial uncertainties which come from weighing mass of the samples, fitting of the Calibration curves, calibration solution of lead, volume of the sample solution and etc. Each partial uncertainty of measurement was analyzed and calculated and the standard uncertainty of 0.068% and the expanded uncertainty of 0.14% were obtained.